This is a difficult one because Dexter was also successful at No.3 like Worrell with an average of over 50, so you could play;

03. Dexter
04. Worrell
05. Flower
06. Sobers

OR
,
03. Dexter
04. Worrell
05. Sobers
06. Walters

Spoilt for choice really

Sobers is probably the only one who can basically bat anywhere from 3 - 7. Flower has played his best cricket at 5, and as a specialist batsman I would probably have him in the side ahead of Dexter and Walters. Also Dexter seems to be predominantly a number 3 batsman. All things considered, he's probably made the right move.

Personally I'd have liked to see Dexter in there, but he does cause a bit of a shuffle if he comes in.